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<h1 class="epydoc">Source Code for <a href="digichef.recommender.utils-module.html">Module digichef.recommender.utils</a></h1>
<pre class="py-src">
<a name="L1"></a><tt class="py-lineno">  1</tt>  <tt class="py-line"><tt class="py-keyword">from</tt> <tt class="py-name">os</tt><tt class="py-op">.</tt><tt id="link-0" class="py-name" targets="Variable digichef.recommender.utils.path=digichef.recommender.utils-module.html#path"><a title="digichef.recommender.utils.path" class="py-name" href="#" onclick="return doclink('link-0', 'path', 'link-0');">path</a></tt> <tt class="py-keyword">import</tt> <tt class="py-name">abspath</tt><tt class="py-op">,</tt> <tt class="py-name">dirname</tt><tt class="py-op">,</tt> <tt class="py-name">join</tt> </tt>
<a name="L2"></a><tt class="py-lineno">  2</tt>  <tt class="py-line"><tt class="py-keyword">import</tt> <tt class="py-name">sys</tt> </tt>
<a name="L3"></a><tt class="py-lineno">  3</tt>  <tt class="py-line"><tt class="py-keyword">from</tt> <tt class="py-name">site</tt> <tt class="py-keyword">import</tt> <tt class="py-name">addsitedir</tt> </tt>
<a name="L4"></a><tt class="py-lineno">  4</tt>  <tt class="py-line"> </tt>
<a name="L5"></a><tt class="py-lineno">  5</tt>  <tt class="py-line"><tt id="link-1" class="py-name"><a title="digichef.recommender.utils.path" class="py-name" href="#" onclick="return doclink('link-1', 'path', 'link-0');">path</a></tt> <tt class="py-op">=</tt> <tt class="py-name">addsitedir</tt><tt class="py-op">(</tt><tt class="py-name">abspath</tt><tt class="py-op">(</tt><tt class="py-name">join</tt><tt class="py-op">(</tt><tt class="py-name">dirname</tt><tt class="py-op">(</tt><tt class="py-name">__file__</tt><tt class="py-op">)</tt><tt class="py-op">,</tt> <tt class="py-string">'site-packages'</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">,</tt> <tt class="py-name">set</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L6"></a><tt class="py-lineno">  6</tt>  <tt class="py-line"><tt class="py-keyword">if</tt> <tt id="link-2" class="py-name"><a title="digichef.recommender.utils.path" class="py-name" href="#" onclick="return doclink('link-2', 'path', 'link-0');">path</a></tt><tt class="py-op">:</tt> <tt class="py-name">sys</tt><tt class="py-op">.</tt><tt id="link-3" class="py-name"><a title="digichef.recommender.utils.path" class="py-name" href="#" onclick="return doclink('link-3', 'path', 'link-0');">path</a></tt> <tt class="py-op">=</tt> <tt class="py-name">list</tt><tt class="py-op">(</tt><tt id="link-4" class="py-name"><a title="digichef.recommender.utils.path" class="py-name" href="#" onclick="return doclink('link-4', 'path', 'link-0');">path</a></tt><tt class="py-op">)</tt> <tt class="py-op">+</tt> <tt class="py-name">sys</tt><tt class="py-op">.</tt><tt id="link-5" class="py-name"><a title="digichef.recommender.utils.path" class="py-name" href="#" onclick="return doclink('link-5', 'path', 'link-0');">path</a></tt> </tt>
<a name="L7"></a><tt class="py-lineno">  7</tt>  <tt class="py-line"> </tt>
<a name="L8"></a><tt class="py-lineno">  8</tt>  <tt class="py-line"><tt class="py-keyword">import</tt> <tt class="py-name">stats</tt> </tt>
<a name="L9"></a><tt class="py-lineno">  9</tt>  <tt class="py-line"> </tt>
<a name="L10"></a><tt class="py-lineno"> 10</tt>  <tt class="py-line"><tt class="py-comment">#Return [0..1] where -1 is not correlated, and 1 is fully correlated</tt> </tt>
<a name="pearson_correlation"></a><div id="pearson_correlation-def"><a name="L11"></a><tt class="py-lineno"> 11</tt> <a class="py-toggle" href="#" id="pearson_correlation-toggle" onclick="return toggle('pearson_correlation');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="digichef.recommender.utils-module.html#pearson_correlation">pearson_correlation</a><tt class="py-op">(</tt><tt class="py-param">v1</tt><tt class="py-op">,</tt><tt class="py-param">v2</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="pearson_correlation-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="pearson_correlation-expanded"><a name="L12"></a><tt class="py-lineno"> 12</tt>  <tt class="py-line">    <tt class="py-docstring">'''&gt;&gt;&gt; v1=[0,10,10,0,10]</tt> </tt>
<a name="L13"></a><tt class="py-lineno"> 13</tt>  <tt class="py-line"><tt class="py-docstring">       &gt;&gt;&gt; v2=[10,0,0,10,0]</tt> </tt>
<a name="L14"></a><tt class="py-lineno"> 14</tt>  <tt class="py-line"><tt class="py-docstring">       &gt;&gt;&gt; pearson_correlation(v1,v2)</tt> </tt>
<a name="L15"></a><tt class="py-lineno"> 15</tt>  <tt class="py-line"><tt class="py-docstring">       0.0</tt> </tt>
<a name="L16"></a><tt class="py-lineno"> 16</tt>  <tt class="py-line"><tt class="py-docstring">       &gt;&gt;&gt; v2=v1</tt> </tt>
<a name="L17"></a><tt class="py-lineno"> 17</tt>  <tt class="py-line"><tt class="py-docstring">       &gt;&gt;&gt; pearson_correlation(v1,v2)</tt> </tt>
<a name="L18"></a><tt class="py-lineno"> 18</tt>  <tt class="py-line"><tt class="py-docstring">       1.0</tt> </tt>
<a name="L19"></a><tt class="py-lineno"> 19</tt>  <tt class="py-line"><tt class="py-docstring">       &gt;&gt;&gt; v2=[0,10,0,10,0]</tt> </tt>
<a name="L20"></a><tt class="py-lineno"> 20</tt>  <tt class="py-line"><tt class="py-docstring">       &gt;&gt;&gt; pearson_correlation(v1,v2)</tt> </tt>
<a name="L21"></a><tt class="py-lineno"> 21</tt>  <tt class="py-line"><tt class="py-docstring">       0.41666666666666669</tt> </tt>
<a name="L22"></a><tt class="py-lineno"> 22</tt>  <tt class="py-line"><tt class="py-docstring">    '''</tt> </tt>
<a name="L23"></a><tt class="py-lineno"> 23</tt>  <tt class="py-line">    <tt class="py-keyword">try</tt><tt class="py-op">:</tt> </tt>
<a name="L24"></a><tt class="py-lineno"> 24</tt>  <tt class="py-line">        <tt class="py-name">pc</tt><tt class="py-op">=</tt> <tt class="py-name">stats</tt><tt class="py-op">.</tt><tt class="py-name">pearsonr</tt><tt class="py-op">(</tt><tt class="py-name">v1</tt><tt class="py-op">,</tt><tt class="py-name">v2</tt><tt class="py-op">)</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt>         </tt>
<a name="L25"></a><tt class="py-lineno"> 25</tt>  <tt class="py-line">    <tt class="py-keyword">except</tt> <tt class="py-op">:</tt> </tt>
<a name="L26"></a><tt class="py-lineno"> 26</tt>  <tt class="py-line">        <tt class="py-name">pc</tt><tt class="py-op">=</tt> <tt class="py-op">-</tt><tt class="py-number">1</tt> </tt>
<a name="L27"></a><tt class="py-lineno"> 27</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt class="py-op">(</tt><tt class="py-name">pc</tt><tt class="py-op">+</tt><tt class="py-number">1.0</tt><tt class="py-op">)</tt><tt class="py-op">/</tt><tt class="py-number">2.0</tt> </tt>
</div><a name="L28"></a><tt class="py-lineno"> 28</tt>  <tt class="py-line"> </tt>
<a name="L29"></a><tt class="py-lineno"> 29</tt>  <tt class="py-line"> </tt>
<a name="tanamoto2"></a><div id="tanamoto2-def"><a name="L30"></a><tt class="py-lineno"> 30</tt> <a class="py-toggle" href="#" id="tanamoto2-toggle" onclick="return toggle('tanamoto2');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="digichef.recommender.utils-module.html#tanamoto2">tanamoto2</a><tt class="py-op">(</tt><tt class="py-param">v1</tt><tt class="py-op">,</tt><tt class="py-param">v2</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="tanamoto2-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="tanamoto2-expanded"><a name="L31"></a><tt class="py-lineno"> 31</tt>  <tt class="py-line">    <tt class="py-docstring">''' &gt;&gt;&gt; v1=['a','b','c']</tt> </tt>
<a name="L32"></a><tt class="py-lineno"> 32</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v2=['c','a','b']</tt> </tt>
<a name="L33"></a><tt class="py-lineno"> 33</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; tanamoto2(v1,v2)</tt> </tt>
<a name="L34"></a><tt class="py-lineno"> 34</tt>  <tt class="py-line"><tt class="py-docstring">        1.0</tt> </tt>
<a name="L35"></a><tt class="py-lineno"> 35</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v2=['e','f','g']</tt> </tt>
<a name="L36"></a><tt class="py-lineno"> 36</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; tanamoto2(v1,v2)</tt> </tt>
<a name="L37"></a><tt class="py-lineno"> 37</tt>  <tt class="py-line"><tt class="py-docstring">        0.0</tt> </tt>
<a name="L38"></a><tt class="py-lineno"> 38</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v2=['c','f','k','a']</tt> </tt>
<a name="L39"></a><tt class="py-lineno"> 39</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; tanamoto2(v1,v2)</tt> </tt>
<a name="L40"></a><tt class="py-lineno"> 40</tt>  <tt class="py-line"><tt class="py-docstring">        0.40000000000000002</tt> </tt>
<a name="L41"></a><tt class="py-lineno"> 41</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v2=['x','f','k','a']</tt> </tt>
<a name="L42"></a><tt class="py-lineno"> 42</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; tanamoto2(v1,v2)</tt> </tt>
<a name="L43"></a><tt class="py-lineno"> 43</tt>  <tt class="py-line"><tt class="py-docstring">        0.16666666666666666</tt> </tt>
<a name="L44"></a><tt class="py-lineno"> 44</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v2=['c','b','k','a']</tt> </tt>
<a name="L45"></a><tt class="py-lineno"> 45</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; tanamoto2(v1,v2)</tt> </tt>
<a name="L46"></a><tt class="py-lineno"> 46</tt>  <tt class="py-line"><tt class="py-docstring">        0.75</tt> </tt>
<a name="L47"></a><tt class="py-lineno"> 47</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v2=['b','g','a','t','c']</tt> </tt>
<a name="L48"></a><tt class="py-lineno"> 48</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v1=['x','y','z','t','v']</tt> </tt>
<a name="L49"></a><tt class="py-lineno"> 49</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; tanamoto2(v1,v2)</tt> </tt>
<a name="L50"></a><tt class="py-lineno"> 50</tt>  <tt class="py-line"><tt class="py-docstring">        0.1111111111111111</tt> </tt>
<a name="L51"></a><tt class="py-lineno"> 51</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v1=['a','b']</tt> </tt>
<a name="L52"></a><tt class="py-lineno"> 52</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; tanamoto2(v1,v2)</tt> </tt>
<a name="L53"></a><tt class="py-lineno"> 53</tt>  <tt class="py-line"><tt class="py-docstring">        0.40000000000000002</tt> </tt>
<a name="L54"></a><tt class="py-lineno"> 54</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; v1=['a','b','x','y','z']</tt> </tt>
<a name="L55"></a><tt class="py-lineno"> 55</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; tanamoto2(v1,v2)</tt> </tt>
<a name="L56"></a><tt class="py-lineno"> 56</tt>  <tt class="py-line"><tt class="py-docstring">        0.25</tt> </tt>
<a name="L57"></a><tt class="py-lineno"> 57</tt>  <tt class="py-line"><tt class="py-docstring">    '''</tt> </tt>
<a name="L58"></a><tt class="py-lineno"> 58</tt>  <tt class="py-line">    <tt class="py-name">c1</tt><tt class="py-op">,</tt><tt class="py-name">c2</tt><tt class="py-op">,</tt><tt class="py-name">shr</tt><tt class="py-op">=</tt><tt class="py-number">0</tt><tt class="py-op">,</tt><tt class="py-number">0</tt><tt class="py-op">,</tt><tt class="py-number">0</tt> </tt>
<a name="L59"></a><tt class="py-lineno"> 59</tt>  <tt class="py-line">    <tt class="py-name">c1</tt><tt class="py-op">=</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">v1</tt><tt class="py-op">)</tt> </tt>
<a name="L60"></a><tt class="py-lineno"> 60</tt>  <tt class="py-line">    <tt class="py-name">c2</tt><tt class="py-op">=</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">v2</tt><tt class="py-op">)</tt> </tt>
<a name="L61"></a><tt class="py-lineno"> 61</tt>  <tt class="py-line">    <tt class="py-name">shr</tt><tt class="py-op">=</tt><tt class="py-number">0</tt> </tt>
<a name="L62"></a><tt class="py-lineno"> 62</tt>  <tt class="py-line">    <tt class="py-keyword">if</tt> <tt class="py-name">c1</tt><tt class="py-op">==</tt><tt class="py-number">0</tt> <tt class="py-keyword">or</tt> <tt class="py-name">c2</tt><tt class="py-op">==</tt><tt class="py-number">0</tt><tt class="py-op">:</tt> <tt class="py-keyword">return</tt> <tt class="py-number">0.0</tt> </tt>
<a name="L63"></a><tt class="py-lineno"> 63</tt>  <tt class="py-line">    <tt class="py-keyword">for</tt> <tt class="py-name">it</tt> <tt class="py-keyword">in</tt> <tt class="py-name">v1</tt><tt class="py-op">:</tt> </tt>
<a name="L64"></a><tt class="py-lineno"> 64</tt>  <tt class="py-line">        <tt class="py-keyword">if</tt> <tt class="py-name">it</tt> <tt class="py-keyword">in</tt> <tt class="py-name">v2</tt><tt class="py-op">:</tt> <tt class="py-name">shr</tt><tt class="py-op">+=</tt><tt class="py-number">1</tt> </tt>
<a name="L65"></a><tt class="py-lineno"> 65</tt>  <tt class="py-line"> </tt>
<a name="L66"></a><tt class="py-lineno"> 66</tt>  <tt class="py-line">    <tt class="py-keyword">if</tt> <tt class="py-name">c1</tt><tt class="py-op">+</tt><tt class="py-name">c2</tt><tt class="py-op">-</tt><tt class="py-name">shr</tt><tt class="py-op">==</tt><tt class="py-number">0</tt><tt class="py-op">:</tt> <tt class="py-keyword">return</tt> <tt class="py-number">0.0</tt> </tt>
<a name="L67"></a><tt class="py-lineno"> 67</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt class="py-op">(</tt><tt class="py-name">float</tt><tt class="py-op">(</tt><tt class="py-name">shr</tt><tt class="py-op">)</tt><tt class="py-op">/</tt><tt class="py-op">(</tt><tt class="py-name">c1</tt><tt class="py-op">+</tt><tt class="py-name">c2</tt><tt class="py-op">-</tt><tt class="py-name">shr</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
</div><a name="L68"></a><tt class="py-lineno"> 68</tt>  <tt class="py-line"> </tt>
<a name="L69"></a><tt class="py-lineno"> 69</tt>  <tt class="py-line"> </tt>
<a name="distance_matrix_p1_p2"></a><div id="distance_matrix_p1_p2-def"><a name="L70"></a><tt class="py-lineno"> 70</tt> <a class="py-toggle" href="#" id="distance_matrix_p1_p2-toggle" onclick="return toggle('distance_matrix_p1_p2');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="digichef.recommender.utils-module.html#distance_matrix_p1_p2">distance_matrix_p1_p2</a><tt class="py-op">(</tt><tt class="py-param">prefs_p1</tt><tt class="py-op">,</tt> <tt class="py-param">prefs_p2</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="distance_matrix_p1_p2-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="distance_matrix_p1_p2-expanded"><a name="L71"></a><tt class="py-lineno"> 71</tt>  <tt class="py-line">    <tt class="py-docstring">''' &gt;&gt;&gt; prefs={}</tt> </tt>
<a name="L72"></a><tt class="py-lineno"> 72</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; prefs['p1']={'item1': 0, 'item2': 0, 'item3': 10, 'item4': 10, 'item5':0}</tt> </tt>
<a name="L73"></a><tt class="py-lineno"> 73</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; prefs['p2']={'item1': 10, 'item2': 10, 'item3': 0, 'item4': 0, 'item5':10}</tt> </tt>
<a name="L74"></a><tt class="py-lineno"> 74</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; prefs['p3']={'item1': 0, 'item2': 10, 'item3': 0, 'item4': 0, 'item5':10}</tt> </tt>
<a name="L75"></a><tt class="py-lineno"> 75</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; prefs['p4']={'item1': 0, 'item2': 0, 'item3': 0, 'item4': 0, 'item5':10}</tt> </tt>
<a name="L76"></a><tt class="py-lineno"> 76</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; distance_matrix_p1_p2(prefs['p1'],prefs['p1'])</tt> </tt>
<a name="L77"></a><tt class="py-lineno"> 77</tt>  <tt class="py-line"><tt class="py-docstring">        1.0</tt> </tt>
<a name="L78"></a><tt class="py-lineno"> 78</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; distance_matrix_p1_p2(prefs['p1'],prefs['p2'])</tt> </tt>
<a name="L79"></a><tt class="py-lineno"> 79</tt>  <tt class="py-line"><tt class="py-docstring">        0.0</tt> </tt>
<a name="L80"></a><tt class="py-lineno"> 80</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; distance_matrix_p1_p2(prefs['p1'],prefs['p3'])</tt> </tt>
<a name="L81"></a><tt class="py-lineno"> 81</tt>  <tt class="py-line"><tt class="py-docstring">        0.16666666666666669</tt> </tt>
<a name="L82"></a><tt class="py-lineno"> 82</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; distance_matrix_p1_p2(prefs['p1'],prefs['p4'])</tt> </tt>
<a name="L83"></a><tt class="py-lineno"> 83</tt>  <tt class="py-line"><tt class="py-docstring">        0.29587585476806849</tt> </tt>
<a name="L84"></a><tt class="py-lineno"> 84</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; distance_matrix_p1_p2(prefs['p2'],prefs['p4'])</tt> </tt>
<a name="L85"></a><tt class="py-lineno"> 85</tt>  <tt class="py-line"><tt class="py-docstring">        0.70412414523193156</tt> </tt>
<a name="L86"></a><tt class="py-lineno"> 86</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; distance_matrix_p1_p2(prefs['p2'],prefs['p3'])</tt> </tt>
<a name="L87"></a><tt class="py-lineno"> 87</tt>  <tt class="py-line"><tt class="py-docstring">        0.83333333333333326</tt> </tt>
<a name="L88"></a><tt class="py-lineno"> 88</tt>  <tt class="py-line"><tt class="py-docstring">    '''</tt>         </tt>
<a name="L89"></a><tt class="py-lineno"> 89</tt>  <tt class="py-line">    <tt class="py-name">v1</tt><tt class="py-op">=</tt><tt class="py-op">[</tt><tt class="py-op">]</tt> </tt>
<a name="L90"></a><tt class="py-lineno"> 90</tt>  <tt class="py-line">    <tt class="py-name">v2</tt><tt class="py-op">=</tt><tt class="py-op">[</tt><tt class="py-op">]</tt> </tt>
<a name="L91"></a><tt class="py-lineno"> 91</tt>  <tt class="py-line">    <tt class="py-keyword">for</tt> <tt class="py-name">item</tt> <tt class="py-keyword">in</tt> <tt class="py-name">prefs_p1</tt><tt class="py-op">:</tt> </tt>
<a name="L92"></a><tt class="py-lineno"> 92</tt>  <tt class="py-line">        <tt class="py-keyword">if</tt> <tt class="py-name">item</tt> <tt class="py-keyword">in</tt> <tt class="py-name">prefs_p2</tt><tt class="py-op">:</tt> </tt>
<a name="L93"></a><tt class="py-lineno"> 93</tt>  <tt class="py-line">            <tt class="py-name">v1</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">prefs_p1</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">.</tt><tt id="link-6" class="py-name" targets="Variable digichef.voting.models.Vote.vote=digichef.voting.models.Vote-class.html#vote"><a title="digichef.voting.models.Vote.vote" class="py-name" href="#" onclick="return doclink('link-6', 'vote', 'link-6');">vote</a></tt><tt class="py-op">)</tt> </tt>
<a name="L94"></a><tt class="py-lineno"> 94</tt>  <tt class="py-line">            <tt class="py-name">v2</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">prefs_p2</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">.</tt><tt id="link-7" class="py-name"><a title="digichef.voting.models.Vote.vote" class="py-name" href="#" onclick="return doclink('link-7', 'vote', 'link-6');">vote</a></tt><tt class="py-op">)</tt> </tt>
<a name="L95"></a><tt class="py-lineno"> 95</tt>  <tt class="py-line">         </tt>
<a name="L96"></a><tt class="py-lineno"> 96</tt>  <tt class="py-line">    <tt class="py-comment"># if they have no ratings in common, return 0</tt> </tt>
<a name="L97"></a><tt class="py-lineno"> 97</tt>  <tt class="py-line">    <tt class="py-keyword">if</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">v1</tt><tt class="py-op">)</tt><tt class="py-op">==</tt><tt class="py-number">0</tt><tt class="py-op">:</tt> <tt class="py-keyword">return</tt> <tt class="py-number">0.0</tt> </tt>
<a name="L98"></a><tt class="py-lineno"> 98</tt>  <tt class="py-line">   </tt>
<a name="L99"></a><tt class="py-lineno"> 99</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt id="link-8" class="py-name" targets="Function digichef.recommender.utils.pearson_correlation()=digichef.recommender.utils-module.html#pearson_correlation"><a title="digichef.recommender.utils.pearson_correlation" class="py-name" href="#" onclick="return doclink('link-8', 'pearson_correlation', 'link-8');">pearson_correlation</a></tt><tt class="py-op">(</tt><tt class="py-name">v1</tt><tt class="py-op">,</tt><tt class="py-name">v2</tt><tt class="py-op">)</tt> </tt>
</div><a name="L100"></a><tt class="py-lineno">100</tt>  <tt class="py-line">     </tt>
<a name="L101"></a><tt class="py-lineno">101</tt>  <tt class="py-line"> </tt>
<a name="get_usb_recommendations"></a><div id="get_usb_recommendations-def"><a name="L102"></a><tt class="py-lineno">102</tt> <a class="py-toggle" href="#" id="get_usb_recommendations-toggle" onclick="return toggle('get_usb_recommendations');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="digichef.recommender.utils-module.html#get_usb_recommendations">get_usb_recommendations</a><tt class="py-op">(</tt><tt class="py-param">element</tt><tt class="py-op">,</tt> <tt class="py-param">matrix</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="get_usb_recommendations-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="get_usb_recommendations-expanded"><a name="L103"></a><tt class="py-lineno">103</tt>  <tt class="py-line">    <tt class="py-docstring">''' Calculates recommendations for a given element by using an average of every other element's rankings.</tt> </tt>
<a name="L104"></a><tt class="py-lineno">104</tt>  <tt class="py-line"><tt class="py-docstring">        Returns a pair (value,element_id), where value is [0..X] where 0 doesn't match, and X fully matches</tt> </tt>
<a name="L105"></a><tt class="py-lineno">105</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; matrix={}</tt> </tt>
<a name="L106"></a><tt class="py-lineno">106</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; matrix['user1']={'item1':-1, 'item3': 1, 'item4': 1, 'item5':0}</tt> </tt>
<a name="L107"></a><tt class="py-lineno">107</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; matrix['user2']={'item1': 1, 'item2': 1, 'item3':-1, 'item4':-1, 'item5':10,'item6':10}</tt> </tt>
<a name="L108"></a><tt class="py-lineno">108</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; matrix['user3']={'item1':-1, 'item2': 1, 'item4':-1, 'item5':10,'item6':10,'item7':-1}</tt> </tt>
<a name="L109"></a><tt class="py-lineno">109</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; matrix['user4']={'item1':-1, 'item2':-1, 'item3':-1, 'item4':-1, 'item5':10,'item7':10,'item8':10}</tt> </tt>
<a name="L110"></a><tt class="py-lineno">110</tt>  <tt class="py-line"><tt class="py-docstring">    '''</tt> </tt>
<a name="L111"></a><tt class="py-lineno">111</tt>  <tt class="py-line">    <tt class="py-name">totals</tt><tt class="py-op">=</tt><tt class="py-op">{</tt><tt class="py-op">}</tt> </tt>
<a name="L112"></a><tt class="py-lineno">112</tt>  <tt class="py-line">    <tt class="py-name">simSums</tt><tt class="py-op">=</tt><tt class="py-op">{</tt><tt class="py-op">}</tt> </tt>
<a name="L113"></a><tt class="py-lineno">113</tt>  <tt class="py-line">    <tt class="py-keyword">for</tt> <tt class="py-name">other</tt> <tt class="py-keyword">in</tt> <tt class="py-name">matrix</tt><tt class="py-op">:</tt> </tt>
<a name="L114"></a><tt class="py-lineno">114</tt>  <tt class="py-line">        <tt class="py-comment"># don't compare me to myself</tt> </tt>
<a name="L115"></a><tt class="py-lineno">115</tt>  <tt class="py-line">        <tt class="py-keyword">if</tt> <tt class="py-name">other</tt><tt class="py-op">==</tt><tt class="py-name">element</tt><tt class="py-op">:</tt> <tt class="py-keyword">continue</tt> </tt>
<a name="L116"></a><tt class="py-lineno">116</tt>  <tt class="py-line">        <tt class="py-name">sim</tt><tt class="py-op">=</tt><tt id="link-9" class="py-name" targets="Function digichef.recommender.utils.distance_matrix_p1_p2()=digichef.recommender.utils-module.html#distance_matrix_p1_p2"><a title="digichef.recommender.utils.distance_matrix_p1_p2" class="py-name" href="#" onclick="return doclink('link-9', 'distance_matrix_p1_p2', 'link-9');">distance_matrix_p1_p2</a></tt><tt class="py-op">(</tt><tt class="py-name">matrix</tt><tt class="py-op">[</tt><tt class="py-name">element</tt><tt class="py-op">]</tt><tt class="py-op">,</tt> <tt class="py-name">matrix</tt><tt class="py-op">[</tt><tt class="py-name">other</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L117"></a><tt class="py-lineno">117</tt>  <tt class="py-line">        <tt class="py-comment"># ignore scores of zero or lower</tt> </tt>
<a name="L118"></a><tt class="py-lineno">118</tt>  <tt class="py-line">        <tt class="py-keyword">if</tt> <tt class="py-name">sim</tt><tt class="py-op">&lt;=</tt><tt class="py-number">0</tt><tt class="py-op">:</tt> <tt class="py-keyword">continue</tt> </tt>
<a name="L119"></a><tt class="py-lineno">119</tt>  <tt class="py-line">        <tt class="py-keyword">for</tt> <tt class="py-name">item</tt> <tt class="py-keyword">in</tt> <tt class="py-name">matrix</tt><tt class="py-op">[</tt><tt class="py-name">other</tt><tt class="py-op">]</tt><tt class="py-op">:</tt> </tt>
<a name="L120"></a><tt class="py-lineno">120</tt>  <tt class="py-line">            <tt class="py-comment"># only score events I haven't seen yet</tt> </tt>
<a name="L121"></a><tt class="py-lineno">121</tt>  <tt class="py-line">            <tt class="py-keyword">if</tt> <tt class="py-name">item</tt> <tt class="py-keyword">not</tt> <tt class="py-keyword">in</tt> <tt class="py-name">matrix</tt><tt class="py-op">[</tt><tt class="py-name">element</tt><tt class="py-op">]</tt><tt class="py-op">:</tt> </tt>
<a name="L122"></a><tt class="py-lineno">122</tt>  <tt class="py-line">                <tt class="py-comment"># Similarity * Score</tt> </tt>
<a name="L123"></a><tt class="py-lineno">123</tt>  <tt class="py-line">                <tt class="py-name">totals</tt><tt class="py-op">.</tt><tt class="py-name">setdefault</tt><tt class="py-op">(</tt><tt class="py-name">item</tt><tt class="py-op">,</tt><tt class="py-number">0</tt><tt class="py-op">)</tt> </tt>
<a name="L124"></a><tt class="py-lineno">124</tt>  <tt class="py-line">                <tt class="py-name">totals</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">+=</tt><tt class="py-name">matrix</tt><tt class="py-op">[</tt><tt class="py-name">other</tt><tt class="py-op">]</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">.</tt><tt id="link-10" class="py-name"><a title="digichef.voting.models.Vote.vote" class="py-name" href="#" onclick="return doclink('link-10', 'vote', 'link-6');">vote</a></tt><tt class="py-op">*</tt><tt class="py-name">sim</tt> </tt>
<a name="L125"></a><tt class="py-lineno">125</tt>  <tt class="py-line">                <tt class="py-comment"># Sum of similarities</tt> </tt>
<a name="L126"></a><tt class="py-lineno">126</tt>  <tt class="py-line">                <tt class="py-name">simSums</tt><tt class="py-op">.</tt><tt class="py-name">setdefault</tt><tt class="py-op">(</tt><tt class="py-name">item</tt><tt class="py-op">,</tt><tt class="py-number">0</tt><tt class="py-op">)</tt> </tt>
<a name="L127"></a><tt class="py-lineno">127</tt>  <tt class="py-line"><tt class="py-comment">#                    simSums[item]+=sim #book</tt> </tt>
<a name="L128"></a><tt class="py-lineno">128</tt>  <tt class="py-line">                <tt class="py-name">simSums</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">+=</tt><tt class="py-number">1</tt> <tt class="py-comment"># my version !!</tt> </tt>
<a name="L129"></a><tt class="py-lineno">129</tt>  <tt class="py-line">    <tt class="py-comment"># Create the normalized list...?</tt> </tt>
<a name="L130"></a><tt class="py-lineno">130</tt>  <tt class="py-line">    <tt class="py-name">rankings</tt><tt class="py-op">=</tt><tt class="py-op">[</tt><tt class="py-op">(</tt><tt class="py-name">total</tt><tt class="py-op">/</tt><tt class="py-name">simSums</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">,</tt><tt class="py-name">item</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">item</tt><tt class="py-op">,</tt><tt class="py-name">total</tt> <tt class="py-keyword">in</tt> <tt class="py-name">totals</tt><tt class="py-op">.</tt><tt class="py-name">items</tt><tt class="py-op">(</tt> <tt class="py-op">)</tt><tt class="py-op">]</tt> </tt>
<a name="L131"></a><tt class="py-lineno">131</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt class="py-name">rankings</tt> </tt>
</div><a name="L132"></a><tt class="py-lineno">132</tt>  <tt class="py-line"> </tt>
<a name="L133"></a><tt class="py-lineno">133</tt>  <tt class="py-line"> </tt>
<a name="kcluster"></a><div id="kcluster-def"><a name="L134"></a><tt class="py-lineno">134</tt> <a class="py-toggle" href="#" id="kcluster-toggle" onclick="return toggle('kcluster');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="digichef.recommender.utils-module.html#kcluster">kcluster</a><tt class="py-op">(</tt><tt class="py-param">votes_matrix</tt><tt class="py-op">,</tt> <tt class="py-param">items</tt><tt class="py-op">,</tt> <tt class="py-param">clusters</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="kcluster-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="kcluster-expanded"><a name="L135"></a><tt class="py-lineno">135</tt>  <tt class="py-line">    <tt class="py-docstring">'''Create k randomly placed centroids</tt> </tt>
<a name="L136"></a><tt class="py-lineno">136</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; votes_matrix={}</tt> </tt>
<a name="L137"></a><tt class="py-lineno">137</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; votes_matrix['u1']={'it1':1,'it2':1,'it3':1,'it4':1,'it5':-1,}</tt> </tt>
<a name="L138"></a><tt class="py-lineno">138</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; votes_matrix['u2']={'it1':-1,'it2':-1,'it3':-1,'it4':-1,'it5':1,}</tt> </tt>
<a name="L139"></a><tt class="py-lineno">139</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; votes_matrix['u3']={'it1':-1,'it2':-1,'it3':-1,'it4':1,'it5':1,}</tt> </tt>
<a name="L140"></a><tt class="py-lineno">140</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; votes_matrix['u4']={'it1':1,'it2':1,'it3':1,'it4':-1,'it5':-1,}</tt> </tt>
<a name="L141"></a><tt class="py-lineno">141</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; votes_matrix['u5']={'it1':1,'it2':-1,'it3':-1,'it4':1,'it5':-1,}</tt> </tt>
<a name="L142"></a><tt class="py-lineno">142</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; items = ['it1','it2','it3','it4','it5']</tt> </tt>
<a name="L143"></a><tt class="py-lineno">143</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; clusters=2</tt> </tt>
<a name="L144"></a><tt class="py-lineno">144</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; best,centroides=kcluster(votes_matrix, items, clusters)</tt> </tt>
<a name="L145"></a><tt class="py-lineno">145</tt>  <tt class="py-line"><tt class="py-docstring">        &gt;&gt;&gt; best</tt> </tt>
<a name="L146"></a><tt class="py-lineno">146</tt>  <tt class="py-line"><tt class="py-docstring">        {0: ['u3', 'u2'], 1: ['u5', 'u4', 'u1']}</tt> </tt>
<a name="L147"></a><tt class="py-lineno">147</tt>  <tt class="py-line"><tt class="py-docstring">    '''</tt> </tt>
<a name="L148"></a><tt class="py-lineno">148</tt>  <tt class="py-line">    <tt class="py-keyword">import</tt> <tt class="py-name">random</tt> </tt>
<a name="L149"></a><tt class="py-lineno">149</tt>  <tt class="py-line">    <tt class="py-name">centroides</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-op">]</tt> </tt>
<a name="L150"></a><tt class="py-lineno">150</tt>  <tt class="py-line">    <tt class="py-keyword">for</tt> <tt class="py-name">cl</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">clusters</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L151"></a><tt class="py-lineno">151</tt>  <tt class="py-line">        <tt class="py-name">matrix_votes</tt> <tt class="py-op">=</tt> <tt class="py-op">{</tt><tt class="py-op">}</tt> </tt>
<a name="L152"></a><tt class="py-lineno">152</tt>  <tt class="py-line">        <tt class="py-keyword">for</tt> <tt class="py-name">item</tt> <tt class="py-keyword">in</tt> <tt class="py-name">items</tt><tt class="py-op">:</tt> </tt>
<a name="L153"></a><tt class="py-lineno">153</tt>  <tt class="py-line">            <tt class="py-name">matrix_votes</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-name">random</tt><tt class="py-op">.</tt><tt class="py-name">random</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L154"></a><tt class="py-lineno">154</tt>  <tt class="py-line">        <tt class="py-name">centroides</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">matrix_votes</tt><tt class="py-op">)</tt> </tt>
<a name="L155"></a><tt class="py-lineno">155</tt>  <tt class="py-line">    <tt class="py-comment">#centroides=[{it1:0.5,it2:1.0,it3:0.7,it4:0.5},{it1:0.0,it2:0.7,it3:0.1,it4:0.3},...]</tt> </tt>
<a name="L156"></a><tt class="py-lineno">156</tt>  <tt class="py-line">     </tt>
<a name="L157"></a><tt class="py-lineno">157</tt>  <tt class="py-line">    <tt class="py-name">lastmatches</tt> <tt class="py-op">=</tt> <tt class="py-name">None</tt> </tt>
<a name="L158"></a><tt class="py-lineno">158</tt>  <tt class="py-line">    <tt class="py-keyword">for</tt> <tt class="py-name">t</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-number">100</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L159"></a><tt class="py-lineno">159</tt>  <tt class="py-line"> </tt>
<a name="L160"></a><tt class="py-lineno">160</tt>  <tt class="py-line">            <tt class="py-name">bestmatches</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-op">[</tt><tt class="py-op">]</tt> <tt class="py-keyword">for</tt> <tt class="py-name">cl</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">clusters</tt><tt class="py-op">)</tt> <tt class="py-op">]</tt> </tt>
<a name="L161"></a><tt class="py-lineno">161</tt>  <tt class="py-line">            <tt class="py-comment">#bestmatches=[[],[],...]</tt> </tt>
<a name="L162"></a><tt class="py-lineno">162</tt>  <tt class="py-line"> </tt>
<a name="L163"></a><tt class="py-lineno">163</tt>  <tt class="py-line">            <tt class="py-comment"># Find which centroid is the closest for each row</tt> </tt>
<a name="L164"></a><tt class="py-lineno">164</tt>  <tt class="py-line">            <tt class="py-keyword">for</tt> <tt class="py-name">uid</tt><tt class="py-op">,</tt> <tt class="py-name">matrix_votes</tt> <tt class="py-keyword">in</tt> <tt class="py-name">votes_matrix</tt><tt class="py-op">.</tt><tt class="py-name">items</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">:</tt>                 </tt>
<a name="L165"></a><tt class="py-lineno">165</tt>  <tt class="py-line">                <tt class="py-name">bestcentr</tt> <tt class="py-op">=</tt> <tt class="py-number">0</tt> </tt>
<a name="L166"></a><tt class="py-lineno">166</tt>  <tt class="py-line">                <tt class="py-name">max_d</tt> <tt class="py-op">=</tt> <tt class="py-number">0</tt> </tt>
<a name="L167"></a><tt class="py-lineno">167</tt>  <tt class="py-line">                <tt class="py-keyword">for</tt> <tt class="py-name">clid</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">clusters</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L168"></a><tt class="py-lineno">168</tt>  <tt class="py-line">                    <tt class="py-name">centroid_votes</tt> <tt class="py-op">=</tt> <tt class="py-name">centroides</tt><tt class="py-op">[</tt><tt class="py-name">clid</tt><tt class="py-op">]</tt> </tt>
<a name="L169"></a><tt class="py-lineno">169</tt>  <tt class="py-line">                    <tt class="py-name">v1</tt><tt class="py-op">,</tt> <tt class="py-name">v2</tt> <tt class="py-op">=</tt><tt class="py-op">[</tt><tt class="py-op">]</tt><tt class="py-op">,</tt> <tt class="py-op">[</tt><tt class="py-op">]</tt> </tt>
<a name="L170"></a><tt class="py-lineno">170</tt>  <tt class="py-line">                    <tt class="py-keyword">for</tt> <tt class="py-name">item</tt> <tt class="py-keyword">in</tt> <tt class="py-name">centroid_votes</tt><tt class="py-op">:</tt> </tt>
<a name="L171"></a><tt class="py-lineno">171</tt>  <tt class="py-line">                        <tt class="py-keyword">if</tt> <tt class="py-name">item</tt><tt class="py-op">.</tt><tt class="py-name">id</tt> <tt class="py-keyword">in</tt> <tt class="py-name">matrix_votes</tt><tt class="py-op">:</tt> </tt>
<a name="L172"></a><tt class="py-lineno">172</tt>  <tt class="py-line">                            <tt class="py-name">v1</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">centroid_votes</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L173"></a><tt class="py-lineno">173</tt>  <tt class="py-line">                            <tt class="py-name">v2</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">matrix_votes</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">.</tt><tt class="py-name">id</tt><tt class="py-op">]</tt><tt class="py-op">.</tt><tt id="link-11" class="py-name"><a title="digichef.voting.models.Vote.vote" class="py-name" href="#" onclick="return doclink('link-11', 'vote', 'link-6');">vote</a></tt><tt class="py-op">)</tt> </tt>
<a name="L174"></a><tt class="py-lineno">174</tt>  <tt class="py-line">                    <tt class="py-name">dist</tt> <tt class="py-op">=</tt> <tt id="link-12" class="py-name"><a title="digichef.recommender.utils.pearson_correlation" class="py-name" href="#" onclick="return doclink('link-12', 'pearson_correlation', 'link-8');">pearson_correlation</a></tt><tt class="py-op">(</tt><tt class="py-name">v1</tt><tt class="py-op">,</tt> <tt class="py-name">v2</tt><tt class="py-op">)</tt> </tt>
<a name="L175"></a><tt class="py-lineno">175</tt>  <tt class="py-line">                    <tt class="py-keyword">if</tt> <tt class="py-name">dist</tt><tt class="py-op">&gt;=</tt><tt class="py-name">max_d</tt><tt class="py-op">:</tt>  </tt>
<a name="L176"></a><tt class="py-lineno">176</tt>  <tt class="py-line">                        <tt class="py-name">bestcentr</tt> <tt class="py-op">=</tt> <tt class="py-name">clid</tt> </tt>
<a name="L177"></a><tt class="py-lineno">177</tt>  <tt class="py-line">                        <tt class="py-name">max_d</tt> <tt class="py-op">=</tt> <tt class="py-name">dist</tt> </tt>
<a name="L178"></a><tt class="py-lineno">178</tt>  <tt class="py-line">                <tt class="py-name">bestmatches</tt><tt class="py-op">[</tt><tt class="py-name">bestcentr</tt><tt class="py-op">]</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">uid</tt><tt class="py-op">)</tt> </tt>
<a name="L179"></a><tt class="py-lineno">179</tt>  <tt class="py-line">            <tt class="py-comment"># If the results are the same as last time, this is complete</tt> </tt>
<a name="L180"></a><tt class="py-lineno">180</tt>  <tt class="py-line">            <tt class="py-keyword">if</tt> <tt class="py-name">bestmatches</tt><tt class="py-op">==</tt><tt class="py-name">lastmatches</tt><tt class="py-op">:</tt> <tt class="py-keyword">break</tt> </tt>
<a name="L181"></a><tt class="py-lineno">181</tt>  <tt class="py-line">            <tt class="py-name">lastmatches</tt> <tt class="py-op">=</tt> <tt class="py-name">bestmatches</tt> </tt>
<a name="L182"></a><tt class="py-lineno">182</tt>  <tt class="py-line">            <tt class="py-comment">#bestmatches=[[us1,us4],[us3],...]</tt> </tt>
<a name="L183"></a><tt class="py-lineno">183</tt>  <tt class="py-line"> </tt>
<a name="L184"></a><tt class="py-lineno">184</tt>  <tt class="py-line">            <tt class="py-comment"># Move the centroids to the average of their members</tt> </tt>
<a name="L185"></a><tt class="py-lineno">185</tt>  <tt class="py-line">            <tt class="py-name">centroides</tt><tt class="py-op">=</tt><tt class="py-op">[</tt><tt class="py-op">]</tt> </tt>
<a name="L186"></a><tt class="py-lineno">186</tt>  <tt class="py-line">            <tt class="py-keyword">for</tt> <tt class="py-name">clid</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">clusters</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L187"></a><tt class="py-lineno">187</tt>  <tt class="py-line">                <tt id="link-13" class="py-name" targets="Variable digichef.addpeople.users=digichef.addpeople-module.html#users"><a title="digichef.addpeople.users" class="py-name" href="#" onclick="return doclink('link-13', 'users', 'link-13');">users</a></tt> <tt class="py-op">=</tt> <tt class="py-name">bestmatches</tt><tt class="py-op">[</tt><tt class="py-name">clid</tt><tt class="py-op">]</tt> </tt>
<a name="L188"></a><tt class="py-lineno">188</tt>  <tt class="py-line">                <tt class="py-name">avgs_row</tt> <tt class="py-op">=</tt> <tt class="py-op">{</tt><tt class="py-op">}</tt> </tt>
<a name="L189"></a><tt class="py-lineno">189</tt>  <tt class="py-line">                <tt class="py-keyword">if</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt id="link-14" class="py-name"><a title="digichef.addpeople.users" class="py-name" href="#" onclick="return doclink('link-14', 'users', 'link-13');">users</a></tt><tt class="py-op">)</tt><tt class="py-op">&gt;</tt><tt class="py-number">0</tt><tt class="py-op">:</tt> </tt>
<a name="L190"></a><tt class="py-lineno">190</tt>  <tt class="py-line">                    <tt class="py-keyword">for</tt> <tt class="py-name">uid</tt> <tt class="py-keyword">in</tt> <tt id="link-15" class="py-name"><a title="digichef.addpeople.users" class="py-name" href="#" onclick="return doclink('link-15', 'users', 'link-13');">users</a></tt><tt class="py-op">:</tt> </tt>
<a name="L191"></a><tt class="py-lineno">191</tt>  <tt class="py-line">                        <tt class="py-keyword">for</tt> <tt class="py-name">item</tt> <tt class="py-keyword">in</tt> <tt class="py-name">items</tt><tt class="py-op">:</tt> </tt>
<a name="L192"></a><tt class="py-lineno">192</tt>  <tt class="py-line">                            <tt class="py-name">avgs_row</tt><tt class="py-op">.</tt><tt class="py-name">setdefault</tt><tt class="py-op">(</tt><tt class="py-name">item</tt><tt class="py-op">,</tt><tt class="py-op">[</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L193"></a><tt class="py-lineno">193</tt>  <tt class="py-line">                            <tt class="py-keyword">if</tt> <tt class="py-name">item</tt><tt class="py-op">.</tt><tt class="py-name">id</tt> <tt class="py-keyword">in</tt> <tt class="py-name">votes_matrix</tt><tt class="py-op">[</tt><tt class="py-name">uid</tt><tt class="py-op">]</tt><tt class="py-op">:</tt> </tt>
<a name="L194"></a><tt class="py-lineno">194</tt>  <tt class="py-line">                                <tt class="py-name">avgs_row</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">votes_matrix</tt><tt class="py-op">[</tt><tt class="py-name">uid</tt><tt class="py-op">]</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">.</tt><tt class="py-name">id</tt><tt class="py-op">]</tt><tt class="py-op">.</tt><tt id="link-16" class="py-name"><a title="digichef.voting.models.Vote.vote" class="py-name" href="#" onclick="return doclink('link-16', 'vote', 'link-6');">vote</a></tt><tt class="py-op">)</tt> </tt>
<a name="L195"></a><tt class="py-lineno">195</tt>  <tt class="py-line">                    <tt class="py-comment">#avgs_row={'it1':[1,-1,-1,1],'it2':[1,1],...}</tt> </tt>
<a name="L196"></a><tt class="py-lineno">196</tt>  <tt class="py-line">                    <tt class="py-keyword">for</tt> <tt class="py-name">item</tt> <tt class="py-keyword">in</tt> <tt class="py-name">items</tt><tt class="py-op">:</tt> </tt>
<a name="L197"></a><tt class="py-lineno">197</tt>  <tt class="py-line">                        <tt class="py-keyword">if</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">avgs_row</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">&gt;</tt><tt class="py-number">0</tt><tt class="py-op">:</tt> </tt>
<a name="L198"></a><tt class="py-lineno">198</tt>  <tt class="py-line">                            <tt class="py-name">avgs_row</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-name">sum</tt><tt class="py-op">(</tt><tt class="py-name">avgs_row</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">/</tt><tt class="py-name">float</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">avgs_row</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L199"></a><tt class="py-lineno">199</tt>  <tt class="py-line">                        <tt class="py-keyword">else</tt><tt class="py-op">:</tt> </tt>
<a name="L200"></a><tt class="py-lineno">200</tt>  <tt class="py-line">                            <tt class="py-name">avgs_row</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt><tt class="py-op">=</tt><tt class="py-number">0.0</tt> </tt>
<a name="L201"></a><tt class="py-lineno">201</tt>  <tt class="py-line">                <tt class="py-keyword">else</tt><tt class="py-op">:</tt> </tt>
<a name="L202"></a><tt class="py-lineno">202</tt>  <tt class="py-line">                    <tt class="py-keyword">for</tt> <tt class="py-name">item</tt> <tt class="py-keyword">in</tt> <tt class="py-name">items</tt><tt class="py-op">:</tt> </tt>
<a name="L203"></a><tt class="py-lineno">203</tt>  <tt class="py-line">                        <tt class="py-name">avgs_row</tt><tt class="py-op">[</tt><tt class="py-name">item</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-number">0.0</tt> </tt>
<a name="L204"></a><tt class="py-lineno">204</tt>  <tt class="py-line">                 </tt>
<a name="L205"></a><tt class="py-lineno">205</tt>  <tt class="py-line">                <tt class="py-name">centroides</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">avgs_row</tt><tt class="py-op">)</tt> </tt>
<a name="L206"></a><tt class="py-lineno">206</tt>  <tt class="py-line">                       </tt>
<a name="L207"></a><tt class="py-lineno">207</tt>  <tt class="py-line">    <tt class="py-comment">#bestmatches=[[us1,us4],[],[us3],[us2,us5,us6],...]</tt> </tt>
<a name="L208"></a><tt class="py-lineno">208</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt class="py-name">bestmatches</tt> </tt>
</div><a name="L209"></a><tt class="py-lineno">209</tt>  <tt class="py-line"> </tt>
<a name="L210"></a><tt class="py-lineno">210</tt>  <tt class="py-line"> </tt>
<a name="_test"></a><div id="_test-def"><a name="L211"></a><tt class="py-lineno">211</tt> <a class="py-toggle" href="#" id="_test-toggle" onclick="return toggle('_test');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="digichef.recommender.utils-module.html#_test">_test</a><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="_test-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="_test-expanded"><a name="L212"></a><tt class="py-lineno">212</tt>  <tt class="py-line">    <tt class="py-keyword">import</tt> <tt class="py-name">doctest</tt> </tt>
<a name="L213"></a><tt class="py-lineno">213</tt>  <tt class="py-line">    <tt class="py-name">doctest</tt><tt class="py-op">.</tt><tt class="py-name">testmod</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
</div><a name="L214"></a><tt class="py-lineno">214</tt>  <tt class="py-line"> </tt>
<a name="L215"></a><tt class="py-lineno">215</tt>  <tt class="py-line"><tt class="py-keyword">if</tt> <tt class="py-name">__name__</tt> <tt class="py-op">==</tt> <tt class="py-string">"__main__"</tt><tt class="py-op">:</tt> </tt>
<a name="L216"></a><tt class="py-lineno">216</tt>  <tt class="py-line">    <tt id="link-17" class="py-name" targets="Function digichef.recommender.utils._test()=digichef.recommender.utils-module.html#_test"><a title="digichef.recommender.utils._test" class="py-name" href="#" onclick="return doclink('link-17', '_test', 'link-17');">_test</a></tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L217"></a><tt class="py-lineno">217</tt>  <tt class="py-line"> </tt><script type="text/javascript">
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